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Volume 74, Issue 12
Displaying 1-7 of 7 articles from this issue
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[in Japanese]2001 Volume 74 Issue 12 Pages 467
Published: 2001
Released on J-STAGE: May 28, 2007
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[in Japanese]2001 Volume 74 Issue 12 Pages 468-476
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (1687K) -
[in Japanese]2001 Volume 74 Issue 12 Pages 477-482
Published: 2001
Released on J-STAGE: May 28, 2007
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Effect of Thin Organic Film Structures on Direct Adhesion between Polymer Plated Metal and Rubber During VulcanizationPeng GONG, Kunio MORI, Yoshiyuki OISHI2001 Volume 74 Issue 12 Pages 483-489
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSThin organic films formed on stainless steel SUS 304 BA substrates by polymer plating of different 6-substituted-1, 3, 5-triazine-2, 4-dithiol monosodium (RTDN) monomers were characterized using reflection absorption Fourier transform infrared spectroscopy (RAS FT-IR), specular reflection FT-IR, transmission FT-IR spectroscopy, Raman spectroscopy, and electron spectroscopy for chemical analysis (ESCA). The insoluble fractions of thin organic films in tetrahydrofuran (THF) were measured representing the cohesive strength or crosslinking extent of the films. RTDN monomers were electrochemically polymerized to triazine thiol polymers containing S-S bonds on the metal substrates through polymer plating treatment. The average orientation of the triazine rings and substituted groups in films was anisotropic and perpendicular to the substrates. The thin organic films were covalently bound to substrates through the S-Fe, or S-Cr bonds. The effect of film crosslinking extent and reactivity to rubber molecules or curing agents on the adhesion strength of adherend of polymer plated metal to peroxide cure system ethylene-propylene rubber (EPDM) was elucidated. In order to obtain high adhesion strength, it is necessary for the thin organic film to have three properties showed as follows: (1) to form chemical bonding at the film/metal interface, (2) to form chemical bonding at the film/rubber interface, (3) to have enough film cohesive strength. The thin organic film by the polymer plating of RTDN monomer just like 6-diallylamino -1, 3, 5-triazine-2, 4-dithiol monosodium (DAN) acts as a reinforcing layer at the interface between metal and rubber to improve the adhesion strength of the adherend.View full abstractDownload PDF (1244K) -
Preparation of Ionic Crosslinking Agent, and Effect of Ionic and Covalent Crosslinking for Physical Properties in Acrylic Elastomers Synthesized by One-Pot MethodMinoru KOBAYASHI, Minoru AOKI, Yoshinobu ASAKO2001 Volume 74 Issue 12 Pages 490-495
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSThe reaction product(ZMAPH)of 1-methacryloyloxyalkyl-2-hydrogen phthalate(MAHP, alkyl: ethy1/i-propy1=1/1 mole)and ZnO was sufficiently soluble in n-butyl acrylate(BA), methyl methacrylate(MMA)or styrene. From IR spectrum, it was estimated that ZMAPH was zinc salt hydrate of MAHP. The elastomers were synthesized by radical copolymerization of BA/MMA(7/3wt.), ZMAPH as ionic crosslinking agent, and/or 1, 2-di(methacryloyldioxy ethyl)phthalate(DMDP) as covalent crosslinking agent. The structure of crosslinking was examined by swelling data and dynamic mechanical analysis. The tensile strength and compression set of elastomers by DMDP were low, and those by ZMAPH were high. The elastomers by DMDP/ZMAPH showed high tensile strength and low compression set. The density of crosslinking by DMDP, obtained from Nielsen's egation, was low, and it by ZMAPH remarkably rose with increasing content of ZMAPH. These results suggest that the ionic crosslinking is composed of weak bond and fine structure, but the covalent crosslinking is composed of strong bond and rough structure.View full abstractDownload PDF (946K) -
The Effects of Copolymerization Compositions for Physical and Dynamic Mechanical Properties of Ionic Crosslinked Acrylic ElastomersMinoru KOBAYASHI, Yoshiyuki TAKAHASHI2001 Volume 74 Issue 12 Pages 496-501
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSThe ionic crosslinked acrylic elastomers were synthesized by radical copolymerization of monomer mixtures composed of soft-type monomers (n-butyl, or 2-ethylhexyl acrylate), hard-type monomers (methyl methacrylate, styrene or t-butylstyrene) and crosslinkable monomers introducing covalent and ionic bondings. As the composition parameter for copolymer, “Averaged Rotation Energy Barrier Value”(Eb(d)) was introduced. The values of Eb (d)were calculated from the each diad's Eb (d) obtained by molecular mechanics (“Dreiding II”) and averaged diad concentrations obtained by copolymerization theory. The linear (negative) relationship between Eb (d) and the products of tensile strength and elongation, TB×EB, was observed, and the linear (positive) relationship between Eb (d) and the areas under tan δ-temperature curves in glass transition regions observed by dynamic mechanical analysis, LA, was observed. These results suggest that Eb (d) is available for the estimation of toughness (TB×EB) and dynamic loss (LA, for damping behavior etc.) of acrylic elastomer.View full abstractDownload PDF (1189K) -
[in Japanese], [in Japanese]2001 Volume 74 Issue 12 Pages 502-504
Published: 2001
Released on J-STAGE: May 28, 2007
JOURNAL FREE ACCESSDownload PDF (565K)
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